Stripping member assembly

ABSTRACT

A device for rapidly releasably connecting a waste stripping pin or reject ejector to a grid or supporting frame. The stripping pin is connected to or forms a part of a leg which in turn is guided for rectilinear movement within a sleeve. The parts are arranged so that the stripping pin and/or its associated pin block and the sleeve sandwich the grid or frame between them with the pin extending from one side of the frame or grid and the leg extending through and protruding from the opposite side of the frame or grid. A simple lever arm or eccentric linkage interconnects the free end of the leg with the sleeve whereby to positively lock the assembly on the grid or frame.

O United States Patent l 3,568,903

[ 72] inventor Pierre Lang [56] References Cited 1 N swltwland UNITED STATES PATENTS v [21] "P 3,055,275 9/1962 Schroter 93/36 [221 F'led May 1969 3 249 272 5/1966 Sea a 225/97X [45] Patented Mar. 9, I971 rp [73] Assignee J. Bobst 8: Sons, Inc. Primary Examiner-Frank T. Yost Prilly, Switzerland Attorney-Hill, Sherman, Meroni, Gross & Simpson [32] Priority May 20, 1968, Apr. 16, 1969 33 S itze land 3 5 and 5721/69 ABSTRACT; A device for rapidly releasably connecting a waste stripping pin or re ect e ector to a grid or supporting frame. The stripping pin is connected to or forms a part of a leg which in turn is guided for rectilinear movement within a sleeve. The parts are arranged so that the stripping pin and/or 5 [54] ASSEMBLY its associated pin block and the sleeve sandwich the grid or aims rawmg frame between them with the pin extending from one side of [52] US. Cl 25/93, the frame or grid and the leg extending through and protrud- 83/103, 93/36, 225/97 ing from the opposite side of the frame or grid. A simple lever [51] Int. Cl B26f 3/00 arm or eccentric linkage interconnects the free end of the leg [50] Field of Search 225/97, 93, with the sleeve whereby to positively lock the assembly on the 5 103; 93/36 (A); 83/103 grid or frame.

49 l I I 7 i i I i' J l I II.) -l |I l m V/i/i STRIPPING MEMBER ASSEMBLY BACKGROUND OF THE INVENTION Field ofthe Invention The device disclosed herein has particular utility on and in connection with die cuttingand creasing assemblies having stripping stations wherein waste portions of a die-cut sheet of paper, cardboard or other sheet stock are adapted to be removed by stripping pins or blocks which for instance may be connected to a frame arranged for relative movement to the cut sheet stock such that on each closing stroke of the frame and sheet, the pins will contact and punch out the waste stock.

I SUMMARY OF THE INVENTION A principal object of this invention ,is to provide a novel and improved means for rapidly releasablyconnecting a stripping pin or block to a grid or frame.

Another and more specific object of the invention resides in the provision of a stripping pin assembly adapted to releasably clamp the mounting frame or grid between to two parts of the assembly with the stripping pin extending from one side thereof.

A more specific object of the invention relates to a stripping pin assembly wherein a sleeve engageable with one side of a grid and a stripping pin block engageable with the other can be locked in a gridgripping position by (a) a-simple lever arm arrangement or (b) a lever and eccentric between the sleeve and a leg extending from the pin block.

These and other objects, features and advantages of the present invention will be understood in greater detail from the following description and the associated drawings wherein reference numerals are utilized to designate preferred embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an arrangement knownin the prior art wherein nails or pins are simply driven in a stripping board which in turn is connected to a stripping frame so that as the machine operator changes form one job run to another, the entire board must be changed to alter the waste removal pattern of the stripper as desired.

FIG. 2 illustrates a well-known form of stripping unit wherein stripping pins are bolted in a desired position in the frame or grid in accordance with the desired waste stripping pattern for any job run. I 1

FIG. 3 illustrates a preformed grid of the type presently in use with devices of the character shown in FIG. 2 and shows both prior art bolted stripping pins as well as those constructed in accordance with this invention mounted on the grid.

FIG. 4 illustrates a variation in the design of the grid with which the novel stripping pin assembly may be used.

FIG. 5 illustrates the lever arm linkage embodiment of the instant invention at the time of placement of the stripping pin assembly on the grid but before the assembly is clamped to the grid.

I FIG. 6 illustrates the stripping pin assembly of FIG. 5 in its clamped and locked position on the grid.

FIG. 7 illustrates another embodiment of the invention wherein a lever and eccentric are employed to clamp the frame on the grid between the sleeve and pin block.

FIG. 8 illustrates a front view of the lever arm illustrated in FIG. 7.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a die cutting machine of the type, for example, which is used to cut and crease material of paper, cardboard or corrugated board stock or the like, it is often desirable to provide a stripping station so that waste from the die-cut product can be removed or stripped prior to stacking of the die-cut product at the delivery end of the machine.

This stripping operation is carried out by taking each successive die-cut sheet from the die cutting press, supporting such sheet on a bed having openings formed therein generally conforming to and underlying the waste" portion of the sheet and then urging a plurality of ejector means which may comprise stripping pins or blocks into engagement with the cutout or waste portions of the sheet to drive suchwaste portions through the openings in the supporting bed. I

Since the waste which must be removed from a die-cut sheet is wholly dependent upoh the design and character of the jobbeing run, the stripping pins must always be capable of being reoriented for each job 'sothat for any job at least one stripping pin or block will overlie each waste portion of the die-cut sheet. I i I In the crudest form of stripper, nails 1 and 2 are simply driven in a board 3 (see FIG. 1) and the board in turn is bolted to a frame 3a which is arranged to have relative reciprocable movement up and own with respect to the die-cut sheet during each machine ycle lonce each time a sheet is drawn to the stripping station) to effect the stripping operation. In such machines, another nail pattern must generally be provided for each job run which is, of course, most expeditiously done by providing different nail boards for each job. It will be appreciated that in some instances the frame carrying the stripping pins may reciprocate and that in others, the bed cartying the sheet may reciprocate but in either event, the result is the same. Relative movement between the two causes the pins or blocks to strike the waste portions of the sheet and drive them out.

In another form of stripper, such as that illustrated in FIG. 2, a frame or grid 4 has a plurality of elongated preformed slots 5 formed therein (see FIG. 3 also) and this grid carries a plurality of stripping pin elements 5a. The pin element has a pin block 7 providingan eccentric mounting for the pin 6 I and a threaded stud 8 extends upwardly therefrom through the frame 4. The stud 8 has a bolt 9 threadedly mounted thereon to securely mount the pin 6 in a fixed position on the grid. The sheet supporting bed or slab 10 is shown generally as having a sheet 10a carried thereon and as having an opening 11 formed therein and conforming generally to the configuration of the waste portion (defined by 11a) stripped from the sheet. FIG. 4 illustrates a modified arrangement of the slot forming the grid. It will become apparent that the stripping pin assembly of this invention and the prior art arrangement of FIG. 2 as well may each be used in conjunction with either type of grid shown in FIGS. 3 and 4 as well as with a solid drilled board or frame such as a plexiglass sheet as well.

The novel stripping pin assembly herein disclosed, however,

is much more readily adjustable on or removable from the grid or frame than is the stripping pin assembly of the prior art.

In FIGS. 5 and 6, there is shown a stripping pin assembly comprising a stripping pin or stud 12, a stripping pin block 13 which is connected to or integral with the stripping pin 12, a

neck 14 extending upwardly from thestripping pin block and preferably integral therewith and an upstanding projection or leg 15 integral with the neck 14. The leg 15 has an out-turned shoulder 16 formed at its base end which serves to guide the sleeve 17 for movement along the leg; 15. The sleeve 17 has a lever arm 18 pivotally carried thereon at the axis 19.

The leg 15 has a second out-tumed shoulder 20 extending therefrom over the shoulder 16 but at the opposite upper end of the leg and this shoulder 20 carries a'lever arm 21 about a pivot 22. One end of the lever arm 21 is interconnected with the lever arm 18 at a pivot 23.

It suffices to say that at least one dimension of the combined stripping pin and stripping pin block is small enough to permit the stripping pin and stripping pin block to be inserted into one of the grid slots 5 from the top and that at least one common dimension of both the sleeve 17 and the stripping pin block are greater than the slot width in one rotated position of the stripping pin assembly. The neck 14 has no cross-sectional dimension greater than the width of the slot 5.

The lengths of the lever arm 18 in relation to the length of leg 15 is such that when the lever arm 21 is rotated from the position illustrated in FIG. to a position aligning the pivots 19, 23 and 22, the distance between the base of the sleeve 17 and the upper surface of the stripping pin block 13 will tend to be just slightly less than the thickness of the frame or grid 4.

In practice, the stripping pin and block are inserted into a slot and the entire stripping pin assembly is then rotated so that portions of the stripping pin block and sleeve each traverse and overlap the slot. The lever arm 21 is then rotated through a counterclockwise motion as viewed in FIG. 5 and through this action, the sell sleeve 17 and stripping pin block sandwich the grid or frame 4 between them. The pivots 19, 22, 23 can actually be brought into alignment with one another due to the elastic' strain on the various interconnected parts. Lastly, the parts are so dimensioned that the lever arm 18 can actually pass through an over-center" position from that wherein the pivots 19, 22, 23 are aligned. Only a very slight degree of over-center movement of the lever arm 18 is permitted, however, due to engagement of the upper free end of arm 18 with the leg and in such position (as shown in FIG. 6) an elastic strain is still put on the parts so that the stripping pin assembly is positively clamped on the frame or grid 4.

For ease of illustration, in both FIGS. 5 and 6, the stripping pin assembly is illustrated from the same side with the slotbearing frame 4 being rotated through 90. It will be understood by those skilled in this art that in practice, of course, the grid or frame 4 does not rotate. The stripping pin assembly is itself rotated after the stripping pin and stripping pin block have been inserted into a slot.

It should further be understood that a simple stripping pin flange could be substituted for the stripping pin block 13 and that the stripping member may comprise simply a block itself without any pin. In any event, it is only necessary that the stripping member be sufficiently small in one dimension to permit its insertion through a slot 5 and sufficiently large in another dimension to permit it (as well as the sleeve 17) to traverse the slot 5 in a rotated position of the stripping pin assembly to permit clamping of the stripping pin assembly on the frame or grid 4.

The embodiment of the invention illustrated in FIG. 7 functions in much the same way to produce the same result. Here, the stripping pin 24 is also shown as being carried on a block 25 to provide for an eccentric pin mounting.

The stripping pin assembly of FIG. 7 has an upstanding leg 26 connected to or integral with the neck 27 which in turn is connected to the pin block 25. The leg 26 has upwardly inclined slot 27 formed therein which opens downwardly and which serves to carry the pivot pin 28 of a lever arm 29. The pin 28 is axially displaced from the longitudinal axis of the lever arm 29 to provide an eccentric. The bifurcated end of the lever arm 29 terminates in two circular profile portions 30 which portions have their axis displaced from the axis of pin 28.

The circular profile portions 30 are engageable with the lip of sleeve 31 (corresponding to sleeve 17) so that by rotating the lever arm 29 in a counterclockwise direction from position 32 to 32' to as viewed in FIG. 7, the portions of the sleeve 31 and flange 25 traversing the slot 5 will clamp the frame or grid 4 between them and thus positively fix the stripping pin assembly in position.

In order to prevent disassembly of the parts when the stripping pin assembly is removed from the frame, a spring pin 33 is provided which extends outwardly from the leg 26 and is movable within an aperture 33 formed in the sleeve 31. The aperture 33 is, of course, large enough to permit the relative axial movement between the sleeve 31 and leg 26 which will accompany rotation of the lever arm 31.

In FIG. 3, one may see the disposition of the parts of the stripping pin assembly of FIG. 7 when the assembly is clamped in position on the grid or frame 4.

Iclaim:

l. A stripping assembly adapted for mounting on a frame having at least one elongated slot formed therein comprising:

a stripping member positionable through said slot so as to extend from one side thereof;

a sleeve positionable on the opposite side of said frame;

said stripping member and sleeve having a least one commonlateral dimension greater than the width of said slot;

a leg extending within said sleeve for rectilinear movement normal to the base of said sleeve;

a neck interconnecting said stripping member and said leg and extending through said slot;

a lever arm pivotally carried on said leg;

a second lever arm pivotally carried on said sleeve;

said lever arms being pivotally interconnected at a pivot 'disposed intermediate the point of pivotal interconnection of said lever arms with said sleeve and leg;

whereby said sleeve and stripping member will engage and grip said frame when the three mentioned pivot points are brought into near alignment with one another; and

means permitting, said pivotally interconnected lever arms to move just past the pivot aligned position and not further in one direction of movement of said lever arms to lock said stripping pin assembly on said frame.

2. A stripping assembly adapted for mounting on a frame having at least one elongated slot formed therein comprising:

a stripping member positionable through said slot so as to extend from one side thereof;

a sleeve positionable on the opposite side of said frame;

said stripping member and sleeve having at least one common lateral dimension greater than the width of said slot;

a leg extending through said sleeve for rectilinear movement normal to the base of said sleeve;

a neck interconnecting said stripping member and said leg and extending through said slot;

an eccentric rotatably mounted on said leg and having a working face engageable with said sleeve; and

a lever arm extending from said eccentric whereby said eccentric can be rotated to draw said sleeve and stripping member into engagement with opposite sides of said frame to sandwich said frame between them and positively clamp said stripping member assembly on said frame.

3. A stripping member assembly releasably mountable on a slotted frame comprising:

A stripping member positionable on one side of said frame and having a at least one dimension parallel to the plane of said frame great enough to traverse the width of one of the slots in said frame;

A clamping member positionable on the opposite side of said frame from said stripping member and traversing the width of said one of said slots;

An extension element connected to said stripping member and extending through said one of said slots; and

Leverage means interconnecting said clamping member with said extension element whereby topermit said stripping member and clamping member to be forced tightly against opposed faces of said frame to fixedly mount said stripping member on said frame.

4. A stripping member assembly constructed in accordance with claim 3 wherein said clamping member comprises a sleeve surrounding said extension element to guide said extension element for rectilinear movement within the said sleeve.

5. A stripping member assembly constructed in accordance with claim 3 wherein said leverage means comprises:

a lever arm pivotally carried on said extension element;

a second lever arm pivotally interconnected with said first mentioned lever arm at a point intermediate the pivot of said first mentioned lever arm with said extension element and said frame; and

means pivotally interconnecting said clamping member with said second lever arm.

6. A stripping member assembly constructed in accordance with claim 5 wherein; the parts are so dimensioned that said clamping member and stripping member clamp frame tightly between them by means including the elasticity of the parts with claim 6 wherein said second lever arm is permitted a limited degree of movement to lock said second lever arm in position with the said pivots nearly aligned.

UNITED STATES PAIENT OFFICE (IER'IIFICA'ITE OF (IORRECTlON Patent No. 3, 568, 903 Dated March 9, 1971 Inventor(s) Pierre Lang It is certified that error appears in the above-identified pate and that said Letters Patent are hereby corrected as shown below:

Column 1, line 25, change "between to two parts" to two .parts--;

line 44, change "form one" to -from one--; line 62, change "1 FIG; 6" to --FIG. 6--. Column 3, line 14, change "the sell sleeve 17" to --the sleeve l7--.

Column 4, line 46, change having a at least" to ha at least--;

line 74, change "clamp frame" to --clamp s2 frame",

Column 6, line 2, change "of movement" to --of over-1 movement--.

Signed and sealed this 26th day 'of October 1971.

(SEAL) Attest:

EDWARD M.FLETCHER,JR. ROBERT GOTTSCHALK Attesting Officer Acting Commissioner of Pa 

1. A stripping assembly adapted for mounting on a frame having at least one elongated slot formed therein comprising: a stripping member positionable through said slot so as to extend from one side thereof; a sleeve positionable on the opposite side of said frame; said stripping member and sleeve having a least one common lateral dimension greater than the width of said slot; a leg extending within said sleeve for rectilinear movement normal to the base of said sleeve; a neck interconnecting said stripping member and said leg and extending through said slot; a lever arm pivotally carried on said leg; a second lever arm pivotally carried on said sleeve; said lever arms being pivotally interconnected at a pivot disposed intermediate the point of pivotal interconnection of said lever arms with said sleeve and leg; whereby said sleeve and stripping member will engage and grip said frame when the three mentioned pivot points are brought into near alignment with one another; and means permitting said pivotally interconnected lever arms to move just past the pivot aligned position and not further in one direction of movement of said lever arms to lock said stripping pin assembly on said frame.
 2. A stripping assembly adapted for mounting on a frame having at least one elongated slot formed therein comprising: a stripping member positionable through said slot so as to extend from one side thereof; a sleeve positionable on the opposite side of said frame; said stripping member and sleeve having at least one common lateral dimension greater than the width of said slot; a leg extending through said sleeve for rectilinear movement normal to the base of said sleeve; a neck interconnecting said stripping member and said leg and extending through said slot; an eccentric rotatably mounted on said leg and having a working face engageable with said sleeve; and a lever arm extending from said eccentric whereby said eccentric can be rotated to draw said sleeve and stripping member into engagement with opposite sides of said frame to sandwich said frame between them and positively clamp said stripping member assembly on said frame.
 3. A stripping member assembly releasably mountable on a slotted frame comprising: A stripping member positionable on one side of said frame and having a at least one dimension parallel to the plane of said frame great enough to traverse the width of one of the slots in said frame; A clamping member positionable on the opposite side of said frame from said stripping member and traversing the width of said one of said slots; An extension element connected to said stripping member and extending through said one of said slots; and Leverage means interconnectIng said clamping member with said extension element whereby to permit said stripping member and clamping member to be forced tightly against opposed faces of said frame to fixedly mount said stripping member on said frame.
 4. A stripping member assembly constructed in accordance with claim 3 wherein said clamping member comprises a sleeve surrounding said extension element to guide said extension element for rectilinear movement within the said sleeve.
 5. A stripping member assembly constructed in accordance with claim 3 wherein said leverage means comprises: a lever arm pivotally carried on said extension element; a second lever arm pivotally interconnected with said first mentioned lever arm at a point intermediate the pivot of said first mentioned lever arm with said extension element and said frame; and means pivotally interconnecting said clamping member with said second lever arm.
 6. A stripping member assembly constructed in accordance with claim 5 wherein; the parts are so dimensioned that said clamping member and stripping member clamp frame tightly between them by means including the elasticity of the parts themselves when the pivots are in near alignment with one another.
 7. A striping member assembly constructed in accordance with claim 6 wherein said second lever arm is permitted a limited degree of movement to lock said second lever arm in position with the said pivots nearly aligned. 